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arXiv 0907.3917hep-phhep-ex
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关于D0 - \overline{D0}和Bs - \overline{Bs}混合的间接CP破坏及其意义

On Indirect CP Violation and Implications for D0-\overline{D0} and Bs -\overline{Bs} mixing

Alexander L. Kagan, Michael D. Sokoloff

摘要:

在没有新的弱相衰变的情况下,将中性介子系统中的两种间接CP破坏联系起来。结果是一个独立于模型的表达式,涉及CP破坏的混合,CP破坏的干扰衰变与不混合,介子的质量和宽度的差异。它涉及到半轻子和含时CP不对称性,以及含时$D^0$ CP不对称性的CP共轭对。在有和没有混合的衰变干扰中的CP破坏与模型建立相关的混合参数有关:非对角混合矩阵元素|M12|、|Gamma12|和phi 12 = arg(M12 /Gamma 12)。将该关系拟合到D 0- \overline{D0}混合数据中,意味着在1 σ下对|phiD12|的灵敏度水平为0.10 [rad]。形式主义扩展到包括新的弱相衰变,并在Gamma 12。相位受到直接CP破坏测量的高度约束。因此,|phiD12|上的边界没有显著改变,并且在高光度的味道工厂(D 0)或LHC(Bs)中,通过违反上述关系,很难观察到衰变中新的弱相的影响,这与直接的CP破坏不同。

英文摘要:

The two kinds of indirect CP violation in neutral meson systems are related, in the absence of new weak phases in decay. The result is a model-independent expression relating CP violation in mixing, CP violation in the interference of decays with and without mixing, and the meson mass and width differences. It relates the semileptonic and time-dependent CP asymmetries; and CP-conjugate pairs of time-dependent $D^0$ CP asymmetries. CP violation in the interference of decays with and without mixing is related to the mixing parameters of relevance to model building: the off-diagonal mixing matrix elements |M12|, |Gamma12|, and phi12 = arg(M12 /Gamma12). Incorporating this relation into a fit to the D0 -\overline{D0} mixing data implies a level of sensitivity to |phiD12| of 0.10 [rad] at 1 sigma. The formalism is extended to include new weak phases in decay, and in Gamma12. The phases are highly constrained by direct CP violation measurements. Consequently, the bounds on |phiD12| are not significantly altered, and the effects of new weak phases in decay could be difficult to observe at a high luminosity flavor factory (D0) or at the LHC (Bs) via violations of the above relations, unlike in direct CP violation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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